/*******************************************************************************
* Copyright (c) 2006, 2012 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Oracle - initial API and implementation
*
******************************************************************************/
package org.eclipse.persistence.jpa.internal.jpql;
import java.util.List;
import org.eclipse.persistence.jpa.jpql.TypeHelper;
import org.eclipse.persistence.jpa.jpql.spi.IType;
import org.eclipse.persistence.jpa.jpql.spi.ITypeDeclaration;
/**
* This {@link Resolver} compares each {@link IType} retrieved from the list of {@link Resolver
* Resolvers} that were gathered for a given {@link Expression} and returns that type if they are
* all the same type otherwise the {@link IType} for <code>Object</code> is returned.
*
* @version 2.3
* @since 2.3
* @author Pascal Filion
*/
final class CollectionEquivalentResolver extends Resolver {
/**
* The list of {@link Resolver resolvers} that were created for each of the encapsulated
* expressions.
*/
private List<Resolver> resolvers;
/**
* Creates a new <code>CollectionEquivalentResolver</code>.
*
* @param parent The parent {@link Resolver}, which is never <code>null</code>
* @param resolvers The list of {@link Resolver resolvers} that were created for each of
* the encapsulated expressions
*/
CollectionEquivalentResolver(Resolver parent, List<Resolver> resolvers) {
super(parent);
this.resolvers = resolvers;
}
/**
* {@inheritDoc}
*/
@Override
public void accept(ResolverVisitor visitor) {
}
/**
* {@inheritDoc}
*/
@Override
IType buildType() {
TypeHelper helper = getTypeHelper();
IType unknownType = helper.unknownType();
IType type = null;
for (int index = 0, count = resolvers.size(); index < count; index++) {
IType anotherType = resolvers.get(index).getType();
if (anotherType == unknownType) {
continue;
}
if (type == null) {
type = anotherType;
}
// Two types are not the same, then the type is Object
else if (!type.equals(anotherType)) {
return helper.objectType();
}
}
if (type == null) {
type = unknownType;
}
return type;
}
/**
* {@inheritDoc}
*/
@Override
ITypeDeclaration buildTypeDeclaration() {
return getType().getTypeDeclaration();
}
}